I have a Select Pro. P setting is at 2 or 3, and on the smoke setting the grill runs consistently at 240 to 250 degrees. I live in Denver, it was about 90 degrees today. The sun was on the grill so I put an umbrella over it to shield it. What's going on? I was cooking ribs today, so it was ok, but I can't leave a brisket or butt overnight at that temp.